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make box expand with 1 image.

Hello,
I was looking at newgrounds.com, and I saw that the backgrounds of their images exist out of only 1 image. - http://img.ngfiles.com/box.gif
Yet, they have rounded corners on both sides (even though the backgound is way bigger) and and their boxes expand.

I've looked at the code, but I cant really see it.
Can someone please explain me?